Such is the feebleness of humanity, such is its perversity, that doubtless it is better for it to be subject to all possible superstitions, as long as they are not murderous, than to live without religion.

Religion was instituted to make us happy in this life and in the other. What must we do to be happy in the life to come? Be just.

— Voltaire

Animals have these advantages over man: they never hear the clock strike, they die without any idea of death, they have no theologians to instruct them, their last moments are not disturbed by unwelcome and unpleasant ceremonies, their funerals cost them nothing, and no one starts lawsuits over their wills.

Every one should be his own physician. We ought to assist, and not to force nature. Eat with moderation...Nothing is good for the body but what we can digest. What medicine can procure digestion? Exercise. What will recruit strength? Sleep.

So long as the people do not care to exercise their freedom, those who wish to tyrannize will do so; for tyrants are active and ardent, and will devote themselves in the name of any number of gods, religious and otherwise, to put shackles upon sleeping men.

When you arise in the morning, give thanks for the morning light, for your life and strength. Give thanks for your food, and the joy of living. Tecumseh Appreciation is a wonderful thing; it makes what is excellent in others belong to us as well.

Descartes constructed as noble a road of science, from the point at which he found geometry to that to which he carried it, as Newton himself did after him. ... He carried this spirit of geometry and invention into optics, which under him became a completely new art.